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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 31,080
    09-30-2005, 09:44 AM Go to last post
  1. Basketball shooting percentage - binomial distribution?

    I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

    Started by DRMORRIS‎, 02-14-2015 01:59 PM
    • Replies: 3
    • Views: 2,559
    02-15-2015, 11:59 AM Go to last post
  2. Negativ Binomial distribution

    I am trying to count number of occurrence for variable X. I have considered X as Poisson distributed since this sounds like a Poisson process. But...

    Started by Alfa‎, 02-14-2015 02:57 AM
    • Replies: 2
    • Views: 2,183
    02-15-2015, 06:15 AM Go to last post
  3. Question Type of Discrete Distribution

    What type of discrete probability distribution is the probabilities of the sum of the outcomes of an infinite number of dice rolls? The probabilities...

    Started by DrAnthonyRodriguez‎, 02-14-2015 05:59 PM
    probability distributions
    • Replies: 2
    • Views: 1,842
    02-15-2015, 06:05 AM Go to last post
  4. difference of two independent Poisson random variables

    Why the difference of two independent Poisson random variables doesn't have Poisson distribution? Demonstrate it.

    Started by LIPI‎, 02-10-2015 07:57 PM
    • Replies: 6
    • Views: 4,473
    02-13-2015, 11:50 AM Go to last post
  5. Bernoulli distribution and PGF

    let Yi,j be independent Bernoulli random variables with E = 1/j. Let Zj = sumYi,j for i=1 to j . Let MZj(s) be the probability generating function...

    Started by aytajalli‎, 02-10-2015 06:11 PM
    • Replies: 6
    • Views: 2,478
    02-12-2015, 01:37 PM Go to last post
  6. Exponential Distribution with uniform random variables

    I choose Θ according to the exponential distribution with mean 1. I then choose 10 i.i.d. random variables X1, . . . , X10, where each Xi has...

    Started by aytajalli‎, 02-11-2015 03:11 PM
    • Replies: 2
    • Views: 2,123
    02-11-2015, 11:42 PM Go to last post
  7. Combinations question

    I have a strange question I hope someone can explain it to me or tell me if there is some type of statistical definition for this process im trying...

    Started by ilikepeas‎, 02-10-2015 12:29 AM
    • Replies: 6
    • Views: 1,694
    02-10-2015, 10:09 PM Go to last post
  8. Error in Mosteller book? Problem 37

    I have been reading this book since I was 13. Time to time I open it and solve one or two problems (if I can). Especially I like problem #37 about a...

    Started by vasyok‎, 02-08-2015 08:48 PM
    • Replies: 4
    • Views: 1,505
    02-09-2015, 05:14 PM Go to last post
  9. Probability of Sporting Event Occurring

    Hello everyone I am trying to establish whether it is possible (or appropriate) to calculate the probability of a sporting event occurring given...

    Started by Regal88‎, 02-09-2015 02:29 PM
    bayes thoerem, football, outcomes, probability, soccer
    • Replies: 0
    • Views: 2,961
    02-09-2015, 02:29 PM Go to last post
  10. Var(X+Y+Z)

    What is the formula for the variance of 3 dependent variables? For 2 dependent variables, the formula is Var(X)+Var(Y)+2*Cov(X,Y) What is...

    Started by shrek‎, 07-08-2008 02:20 PM
    • Replies: 6
    • Views: 69,949
    02-09-2015, 02:15 AM Go to last post
  11. I need a lot of help!

    Hi guys. I have some questions and I will really appreciate your help! <3 1. (c) “Whenever possible, open-ended classes should be avoided.”...

    Started by plaide‎, 02-08-2015 01:47 AM
    • Replies: 0
    • Views: 3,661
    02-08-2015, 01:47 AM Go to last post
  12. Combinatorial Analysis HW Help

    There are 100 U.S Senators, two from each of the 50 States. If 12 Senators are randomly chosen to form a committee, what is the probabilty that...

    Started by blackhaze5‎, 02-08-2015 12:36 AM
    combinations, combinatorics, probability
    • Replies: 0
    • Views: 1,656
    02-08-2015, 12:36 AM Go to last post
  13. Probability

    A hiker is lost in a cave, and he wants to get out of the cave. Three passages are open to her. The first passage leads to the outside after 1 hour...

    Started by random_J‎, 02-06-2015 02:30 AM
    • Replies: 3
    • Views: 2,423
    02-06-2015, 01:06 PM Go to last post
  14. I need your help!

    (a) Bottle 1 consists of 4 red balls and 6 blue balls. Bottle 2 consists of some unknown number of red balls and 12 blue balls. One ball is drawn...

    Started by plaide‎, 02-06-2015 07:52 AM
    • Replies: 1
    • Views: 1,757
    02-06-2015, 08:11 AM Go to last post
  15. Question Stuck with a (i think) simple problem

    Hi everybody, I have a question here that I'm completely brain frozen with.. (I'm not the youngest anymore, and I can't seem to wrap my brain around...

    Started by derBrain‎, 02-04-2015 04:31 PM
    • Replies: 5
    • Views: 1,967
    02-05-2015, 01:39 PM Go to last post
  16. Probability of Failure of components...

    Hi there, My question is pretty simple, but I think I am going about the wrong way. An aircraft part has a .40 probability of being...

    Started by ChinookDriver47‎, 02-04-2015 09:21 PM
    • Replies: 1
    • Views: 956
    02-05-2015, 12:40 AM Go to last post
  17. Question Calculating Sensitivity and Specificity of Combined Testing...With a Surprise.

    Ok guys. I have an interesting question. I'm a biomedical engineering student from Georgia Tech and for one of my classes I have to implement...

    Started by ErikSampayo‎, 01-27-2015 01:49 PM
    conditional testing, rescreening, screening, sensitivity, specificity
    • Replies: 5
    • Views: 1,649
    02-03-2015, 09:35 AM Go to last post
  18. Problem regarding expectation, cdf

    There are two random variables X1, X2 that are iid and continuous. Their cdf is F(x)= P(Xi<x). Show P(X1<X2) = E(F(X1)) Show that E(F(X1)) = 1/2....

    Started by icecream12345‎, 02-01-2015 02:09 AM
    • Replies: 3
    • Views: 1,407
    02-01-2015, 03:16 PM Go to last post
  19. Simple Probability

    Years since I have done stats, just want to check I have done this correct: If amazon use 3 companies to deliver parcels, Royal Mail, City Link,...

    Started by calypso‎, 02-01-2015 12:56 PM
    • Replies: 2
    • Views: 1,360
    02-01-2015, 01:59 PM Go to last post
  20. Simple probablility question. Been years since I have studied this stuff.

    I am writing a script that is sort of like a slot machine. Here is how it works random numbers are chosen that are between 0-9 This is done 4...

    Started by mrdobalina‎, 02-01-2015 01:42 AM
    • Replies: 1
    • Views: 1,240
    02-01-2015, 09:34 AM Go to last post
  21. MGF, Moment-Generating Function

    Let X1 and X2 be two independent random variables. Let X1 and Y = X1 + X2 be χ2(r1) (Chi Square) and χ2(r), respectively, where r1 < r. (a) Find...

    Started by aytajalli‎, 01-29-2015 11:50 PM
    chi square, mgf
    • Replies: 4
    • Views: 1,547
    01-31-2015, 04:58 PM Go to last post
  22. Acceptance Testing - Calculating Type 1 and Type 2 Errors

    Removed...

    Started by bluejay‎, 01-27-2015 01:51 AM
    • Replies: 1
    • Views: 1,637
    01-27-2015, 11:25 AM Go to last post
  23. When are you using: Bayes or discriteet or norminal

    WHEN ARE YOU USING: BAYES OR DISCRITEET (BIO) OR NORMINAL (CONTINU) PROPABILITY? THE FORMULES ARE WRITTEN IN MY TEXTBOOK and i understand the...

    Started by ozkan‎, 01-25-2015 06:55 PM
    • Replies: 0
    • Views: 1,615
    01-25-2015, 06:55 PM Go to last post
  24. Probability of unavailability and one more question please help to me.

    Hi all helpful people :) Please answer that , I didn't think about it . My knowledge not enough for this question. 4. In a certain company, the...

    Started by gkhn_06‎, 01-24-2015 12:05 PM
    • Replies: 0
    • Views: 2,068
    01-24-2015, 12:05 PM Go to last post
  25. Conditional probability of an event given two independent events

    I am dealing with an interesting probability problem. I had 16 subjects randomly divided into 4 different rooms, each room having 4 seats. The...

    Started by Blain Waan‎, 01-19-2015 11:17 AM
    probability, probability help, probability question
    • Replies: 2
    • Views: 2,009
    01-20-2015, 08:14 AM Go to last post
  26. Joint Probability Distribution from Drawing 5 Cards

    Consider drawing 5 cards from a standard poker deck without replacement. I am attempting to construct a joint probability distribution table for 2...

    Started by wyngarth‎, 01-03-2015 03:40 PM
    • Replies: 8
    • Views: 3,474
    01-17-2015, 12:58 PM Go to last post
  27. Expected utility of portfolio problem

    Can someone show that the problem of maximizing 2.1 is equivalent to the problem of maximizing 2.2. Step by step description please. See the attached...

    Started by Stats2‎, 01-16-2015 03:32 PM
    • Replies: 0
    • Views: 1,406
    01-16-2015, 03:32 PM Go to last post
  28. Question Multiple Events and Cumulative Probability Calculation(s)

    Hi! I don't know statistics, hopefully someone will kindly help me. I'd like to learn how to calculate the probability of an event happening Y...

    Started by Nalgarryn‎, 01-13-2015 03:16 PM
    independent events, iterated probability, multiple events
    • Replies: 1
    • Views: 2,451
    01-13-2015, 03:22 PM Go to last post
  29. Probability in online casino slot machines: Dilemma

    Hi there, I am new here, but I have come as I am interested to see what people make of this. I am part of an online community that collectively...

    Started by packtim‎, 01-13-2015 08:38 AM
    • Replies: 3
    • Views: 2,142
    01-13-2015, 03:07 PM Go to last post
  30. [ASK] Doctrine of Chances by Abraham de Moivre

    Doctrine of Chance is a book published by Abraham de Moivre in 1718. It was on the sbuject of probability containing many innovations such as method...

    Started by Monox D. I-Fly‎, 01-09-2015 10:29 PM
    • Replies: 0
    • Views: 1,773
    01-09-2015, 10:29 PM Go to last post
  31. Standard deviation

    Hello To solve the exercise below, I need the standard deviation =σ I have no clue to get it out of the values below: A researcher wants to know...

    Started by roger20‎, 01-09-2015 01:17 PM
    • Replies: 3
    • Views: 3,124
    01-09-2015, 01:38 PM Go to last post
  32. Request for help in probability question.

    There are 50,000 applicants out of which, 20,000 applicants needs to be picked. 1. What is the probability that an applicant say "Joel" is...

    Started by Johnutsa1‎, 01-08-2015 04:08 PM
    • Replies: 0
    • Views: 1,275
    01-08-2015, 04:08 PM Go to last post
  33. Request for help on probability.

    Hi All, I need your help to solve this question. I am preparing for exam and trying to solve this question. A ball is selected from a box...

    Started by anna1999‎, 01-07-2015 03:37 PM
    • Replies: 1
    • Views: 1,084
    01-07-2015, 03:47 PM Go to last post
  34. Reversing the moment generating function

    So this is my moment generating function \frac{e^{-2t}+e^{-t}+e^{t}+e^{2t}}{4} Now i need to find the PDF or CDF So i think the moment...

    Started by studentbelg‎, 01-06-2015 02:29 PM
    • Replies: 1
    • Views: 1,347
    01-06-2015, 05:24 PM Go to last post
  35. Computing MLE estimate

    So I have so i'm stuck at taking the log :mad: can somoene help me ?

    Started by studentbelg‎, 12-01-2014 03:33 PM
    • Replies: 5
    • Views: 2,264
    01-06-2015, 01:17 PM Go to last post
  36. Conditional normal implying independence

    So reading a book someone comment that e \lvert x \sim N(0,1) hence e is independent of x. Why is this the case? Trying to prove this to myself...

    Started by JesperHP‎, 01-03-2015 12:59 PM
    • Replies: 1
    • Views: 1,809
    01-06-2015, 05:19 AM Go to last post
  37. Expected value and variance of profit

    Hello all, I have this question, which I think I partially knows how to solve, but need some completion. "A man is playing versus a machine in the...

    Started by Yankel‎, 01-06-2015 02:43 AM
    • Replies: 1
    • Views: 2,766
    01-06-2015, 04:53 AM Go to last post
  38. P-value from test statistic

    I'm given a test-statistic of 2.4 in one of those H0 type problem with a 0.05 significance level. In the z-table, if you look up 2.4, it says 0.0082....

    Started by robbiesqp‎, 12-11-2009 07:02 PM
    • Replies: 8
    • Views: 35,703
    01-01-2015, 10:33 PM Go to last post
  39. An engineer has observed that the gap times between...

    I am struggling with this question ..please help An engineer has observed that the gap times between vehicles passing a certain point on a...

    Started by Jeff Hardy‎, 12-31-2014 11:19 AM
    • Replies: 2
    • Views: 2,741
    12-31-2014, 04:23 PM Go to last post
  40. precision of two independent classifiers

    Consider two classifiers A and B giving binary labels to a big set of candidates, say, we have a million cats and a million dogs for labeling. Assume...

    Started by Zewei‎, 12-29-2014 10:12 AM
    machine learning, precision, probability
    • Replies: 0
    • Views: 1,263
    12-29-2014, 10:12 AM Go to last post
  41. Please help calculate the odds of this

    First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

    Started by acofgb‎, 12-22-2014 12:55 PM
    • Replies: 11
    • Views: 2,266
    12-23-2014, 05:42 PM Go to last post
  42. Group Probability Problem

    Hi, I'm having a difficult time figuring out an approach to a problem and could use some help -- if I have a team of 5 basketball players, each...

    Started by bprs0713‎, 12-18-2014 08:40 PM
    • Replies: 3
    • Views: 1,639
    12-19-2014, 01:31 PM Go to last post
  43. Interpreting negative binomial regression with log transformed independent variables

    My independent variables were highly skewed, so to normalise the distribution they were log transformed. Also since there were zeros in the data,...

    Started by peter t.‎, 12-19-2014 01:12 PM
    incidence rate, lognormal, negative binomial model, regression
    • Replies: 0
    • Views: 2,268
    12-19-2014, 01:12 PM Go to last post
  44. Question Confidence Intervals

    Hi I am new to stats and really spending lots of time on concepts which I can build on, I thought I was fairly comfortable with confidence...

    Started by Golf39‎, 12-16-2014 05:53 AM
    • Replies: 5
    • Views: 2,676
    12-19-2014, 03:12 AM Go to last post
  45. Dice probability problem

    Hi everyone, I have a simple dice problem but am having trouble with it because it's hard to google something like this. Here it is... I have...

    Started by benali‎, 12-15-2014 07:39 PM
    • Replies: 2
    • Views: 1,716
    12-16-2014, 08:56 AM Go to last post
  46. I can't undertand two problem..

    Hello everyone, I can't solve 2 problem during 4 hours.... Suppose that a tray of eggs consists 10 egg and there are 10 trays(i.e. there is 100...

    Started by doggra‎, 12-15-2014 05:50 AM
    • Replies: 3
    • Views: 1,995
    12-15-2014, 11:40 AM Go to last post
  47. red balls and blue balls

    Hi there everyone I'm a complete newbie to probability and currently taking a foundation degree at Uni of which statistics is one of my modules. I...

    Started by timlazisa‎, 12-10-2014 01:01 PM
    • Replies: 9
    • Views: 2,663
    12-14-2014, 07:40 AM Go to last post
  48. Tree diagram

    trying to complete this mock test and paper I don't get this at all can anyone help please? I have attached a pdf of the paper and 3 questions.

    Started by timlazisa‎, 12-12-2014 04:44 PM
    • Replies: 0
    • Views: 1,721
    12-12-2014, 04:44 PM Go to last post
  49. confidence levels on 2d \chi^2 grid, where the minimum \chi^2 is not near 1.

    Hallo everybody! I have the following problem: I obtained a 2D grid of reduced \Chi^2 fits, where the the minimum \Chi^2 is far from unit (1)....

    Started by Trifonov‎, 12-12-2014 04:38 AM
    • Replies: 0
    • Views: 2,238
    12-12-2014, 04:38 AM Go to last post
  50. A couple Normal Distribution Probability problems

    I've been trying to figure out the answer to these two problems for weeks, but I can't seem to figure out how to do them. Please let me know if you...

    Started by meaght12‎, 12-11-2014 02:19 PM
    • Replies: 7
    • Views: 2,262
    12-11-2014, 04:58 PM Go to last post
  51. Probability problem

    An experiment consists of flipping one coin four times. Give a pair of events that are independent and a pair of events that that are dependent, and...

    Started by BubblesMagee‎, 12-11-2014 03:12 AM
    • Replies: 0
    • Views: 1,300
    12-11-2014, 03:12 AM Go to last post
  52. Distribution of a function of random variables problem

    First off, I'm new to this forum and Probability and Statistics. I'm a junior in college and currently taking my first course in this subject and...

    Started by tnvy04‎, 12-10-2014 10:07 PM
    • Replies: 1
    • Views: 1,732
    12-10-2014, 11:19 PM Go to last post
  53. Equal chance of random selection when halves of set are balanced?

    Design: For 18 trials numbers (either 0 or 1) are randomly selected, a random portion of the first 9 are 0 and the last 9 are set as the opposite...

    Started by Oeei922331100‎, 12-10-2014 02:34 PM
    combinatorics, permutation, probabilistic sampling, probabilities, random
    • Replies: 0
    • Views: 1,246
    12-10-2014, 02:34 PM Go to last post
  54. Question: Determining percentage of probability

    Hello, I'm in the middle of working on an assignment that involves determining probability. I wanted to see if I am on the right track. Any help...

    Started by sditizio‎, 12-09-2014 12:07 AM
    • Replies: 1
    • Views: 1,296
    12-09-2014, 01:34 AM Go to last post
  55. probability function of sum of multiple normal distributions

    I have four normally distributed random variables which may/may not be correlated. I want to find the probability distribution function of the...

    Started by Sf26‎, 12-08-2014 01:30 PM
    • Replies: 4
    • Views: 1,624
    12-08-2014, 02:50 PM Go to last post
  56. Central Limit Theorem

    If X is a Gamma(n,1). For which values of n we have P(|\frac{X}{n}-1|>0.01)<0.1 If n=n_0 is the first value of n that satisfies the above equation,...

    Started by askazy‎, 12-06-2014 10:55 AM
    • Replies: 3
    • Views: 1,847
    12-08-2014, 06:25 AM Go to last post
  57. Convergence in Distribution

    If X_n is a sequence of random variables independent and X_n is Binomial(n,p) with 0<p<1 and either T_n=\frac{X_n}{n} for all n 1) Show that...

    Started by askazy‎, 12-06-2014 05:50 PM
    • Replies: 3
    • Views: 1,199
    12-07-2014, 11:08 AM Go to last post
  58. Markov Inequality

    If X_1,X_2,X_3...X_{20} are independent random variables with common distribution Poisson(1). Find with markov inequality a upper limit for...

    Started by askazy‎, 12-06-2014 03:00 PM
    • Replies: 6
    • Views: 1,515
    12-06-2014, 04:58 PM Go to last post
  59. Binomial Test in Excel

    What is the probability of getting AT LEAST 79 out of 90 correct on a True or False test if you are guessing on every question? I think I need to...

    Started by bengalgirl‎, 12-06-2014 04:46 PM
    binomial distribution, excel
    • Replies: 0
    • Views: 2,489
    12-06-2014, 04:46 PM Go to last post
  60. Convergence

    If Z_n = \frac{1}{n}*\sum_{i=1}^nX_i^2 where X_i=N(\mu,\sigma^2) 1) Show that Z_n \rightarrow^p \mu^2+\sigma^2(convergence in probability) I...

    Started by askazy‎, 12-03-2014 04:50 PM
    • Replies: 12
    • Views: 2,288
    12-06-2014, 10:46 AM Go to last post

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